The aluminum body is coated with a nonstick interior, while the outside is hard anodized. All the pans include glass lids, except the 8", 10" and 12" saute pans. All handles are stainless-steel casting handles. Why Cook with Hard-Anodized Aluminum? Aluminum is well-known for its ability to transfer heat and distribute it evenly. For that reason, chefs around the world choose it for their cooking needs. Hard-anodized aluminum is specially treated to make the metal stronger, improve its resistance to abrasion and prevent chemicals from leaching into the food. It can take abuse from various kitchen utensils and can be used in an oven as hot as 350°F. What Benefits Come from Nonstick Surfaces? When aluminum is hard-anodized, it has fewer pores in its surface. This makes it a great nonstick solution because the food cannot sink into it and get stuck there. Because the surface is so resistant to sticking, you don’t have to use as much oil or grease while cooking. This reduces the fat content of your meals. It also makes the clean-up process faster and easier. Say goodbye to heavy scrubbing and scraping that could damage your cooking surfaces.